GB921262A - Improvements relating to variable resistors - Google Patents

Improvements relating to variable resistors

Info

Publication number
GB921262A
GB921262A GB686460A GB686460A GB921262A GB 921262 A GB921262 A GB 921262A GB 686460 A GB686460 A GB 686460A GB 686460 A GB686460 A GB 686460A GB 921262 A GB921262 A GB 921262A
Authority
GB
United Kingdom
Prior art keywords
photo
resistance
conductive material
hole
variable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB686460A
Inventor
Derek Hubert Mash
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB686460A priority Critical patent/GB921262A/en
Publication of GB921262A publication Critical patent/GB921262A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/12—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto
    • H01L31/16—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto the semiconductor device sensitive to radiation being controlled by the light source or sources
    • H01L31/161—Semiconductor device sensitive to radiation without a potential-jump or surface barrier, e.g. photoresistors
    • H01L31/164—Optical potentiometers

Abstract

921,262. Photo-electric devices. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Feb. 6, 1961 [Feb. 26, 1960], No. 6864/60. Class 40 (3). [Also in Group XXXVI] A variable resistor comprises a non-uniform light filter placed between a constant light source and a photo-conductive material so that the resistance between two terminals connected to the material is variable by relative movement of the filter. In Fig. 1, an opaque screen 5 with a hole or slit 6 is placed between electric light source 2 and a photo-conductive body 5 with terminals 8. A cylinder 9 consists of glass with a photographic emulsion coating of varying density situated opposite hole 6; cylinder 9 may be rotated by knob 10 to vary the intensity of light falling on body 7 and thus its resistance. The photo-conductive material may consist of selenium or cadmium sulphide, activated if desired with copper or chlorine, and may be a thin film, a sintered powder or a single crystal. In an alternative arrangement relative rotation of two polarized discs is used instead of the variable density emulsion. Two bodies of photo-conductive material may be used, each associated with a hole in the screen 5 and the associated filter element, the arrangement being such that turning knob 10 increases the resistance of one body while decreasing the resistance of the other thereby forming a potentiometer. Reference has been directed by the Comptroller to Specification 879,949.
GB686460A 1960-02-26 1960-02-26 Improvements relating to variable resistors Expired GB921262A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB686460A GB921262A (en) 1960-02-26 1960-02-26 Improvements relating to variable resistors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB686460A GB921262A (en) 1960-02-26 1960-02-26 Improvements relating to variable resistors

Publications (1)

Publication Number Publication Date
GB921262A true GB921262A (en) 1963-03-20

Family

ID=9822157

Family Applications (1)

Application Number Title Priority Date Filing Date
GB686460A Expired GB921262A (en) 1960-02-26 1960-02-26 Improvements relating to variable resistors

Country Status (1)

Country Link
GB (1) GB921262A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459523A (en) * 1983-03-11 1984-07-10 Tipper Tie, Inc. Motor speed control
WO1996008042A1 (en) * 1994-09-05 1996-03-14 Bloemen Joost Lodewijk Karel F Digital potentiometer with a servo motor and an absolute optical position-encoder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459523A (en) * 1983-03-11 1984-07-10 Tipper Tie, Inc. Motor speed control
WO1996008042A1 (en) * 1994-09-05 1996-03-14 Bloemen Joost Lodewijk Karel F Digital potentiometer with a servo motor and an absolute optical position-encoder

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